Valve



July 22, 1947.- F. L. PARS I 2,424,328

VALVE Filed Sept. 7, 1944 INVENT R ATTO RN EY Patented July 22, 1947 UNITED STATES PATENT OFFICE 1 Claim.

My invention relates to a valve in which the rate of passage or flow of a liquid or fluid therethrough may be very accurately and uniformly controlled from Zero to full flow. This accuracy of control is attained in my invention with a minimum of moving parts.

In my invention the valve comprises a housing having a recess tapered at its bottom to a conical surface and a plug rotatable in this recess and having a conical surface fitting tight against the conical surface of the recess. The conical surface of the plug is resiliently pressed against that of the recess, as by a spring, to insure a tight contact. An inlet port opens through the conical surface of the recess in position to communicate with a groove on the conical surface of the plug which may be rotated to move the groove out of communication with the port and close the valve or to move it into communication with the port to provide a passageway that widens progressively and gradually from zero to a maximum as the plug is rotated. A duct through the plug leads from the groove to an outlet port of the housing.

The inlet and outlet ports of the recess are sealed from each other by the plug preferably by having the conical surfaces of the plug and recess lapped to a fluid-tight contact and having the plug spring pressed into the recess.

Various features of my invention are illustrated, by way of example, in the accompanying drawings in which Fig. l is a vertical section of a valve embodying a preferred form of the invention, and Fig. 2 is a horizontal section of the valve taken on line 22 of Fig. 1.

In the embodiment of the invention shown in the accompanying drawings a valve housing or casing it having an inlet nipple II and outlet nipple I2 is provided with a cylindrical recess 13 extending downwardly and having a tapered or conical lower end M. An inlet port l5 extends from the inlet nipple I l to the conical or tapered surface M. An outlet duct or port l6 extends from the lower end or point of the conical surface to the outlet nipple l2. The housing is provided with a bonnet l! which preferably screws onto a flange ill of the housing to close the recess.

Mounted in the recess l3 and closely fitting the cylindrical and tapered or conical surfaces thereof is a rotatable plug l9 which closes direct communication between the ports l4 and IS. The plug I 9 has an upwardly extending spindle 23 which passes through an opening in the bonnet l l and is provided at its upper end with a handle 2| whereby the spindle and plug l9 may be rotated.

The plug i9 is pressed downwardly by a spring 22 bearing against the upper surface of the plug about the spindle and confined in a recess 23 in the bonnet ii. The spring 22 presses the plug downwardly with sufficient force to bring the lower conical surface of the plug into a tight, preferably fluid-tight, contact with the conical surface l l of the recess.

The conical surfaces of the plug and recess fit tightly in all positions of rotation of the plug and are preferably lapped to insure a tight contact so as to prevent any passage of fluid from the inlet port l5 between these surfaces to the outlet duct or port IS.

The plug I9 is provided in its conical or tapered surface with a groove 24 at such a height that it H may communicate with the port I5 when turned to the proper angle relative thereto.

The groove 24 is preferably tapered so that as it is moved into communication with the port l5, as for example in turning counterclockwise in the position shown in Fig. 2, communication will first be through the very tip of the groove and, therefore, affording a minimum passageway. On further turning communication between the groove 24 and the port [5 widens until the maximum is provided. Fluid entering the groove 24 from the port I 5 may then flow through a radial duct 25 to approximately the center of the plug and communicates with a downwardly extending dlct 26 which opens into the outlet port or duct l The passageways 25, 26 and it are equal to the maximum passage between the inlet port I5 and the groove 24 so that the size of the opening between the port l5 and the groove 24 will control the flow of fluid by having the groove 24 tapered. The increase in the passageway may be made very gradually and the widening of the groove or deepening of it may be such as to provide a proportionate flow for the rotation of the plug.

While a preferred form of groove has been illustrated, it will be understood that the shape of the groove may be varied provided that the area of the port that it overlaps progressively increases uniformly as the plug is turned or provides a passageway through the groove that enlarges progressively and uniformly with the turning of the plug.

It will be understood that while the port I5 has been described as an inlet port, and the port [6 as an outlet port, the direction of flow of the fluid may be reversed, IS becoming the inlet port and IS the outlet port.

What I claim is:

A valve comprising a housing having a recess with a cylindrical side wall and a conical surface tapering away from said cylindrical wall, an inlet duct opening on said conical surface and an outlet duct leading from its apex, a plug rotatable in said recess and having a cylindrical guide surface fitting the cylindrical surface of said recess and a conical surface complementary to the conical surface of said recess and in fluidtight contact therewith, said plug having a. groove in its conical surface movable into and out of registry with said inlet duct as said plug is rotated, said groove being constructed and arranged to variably throttle the inlet duct on ro tation of said plug and a passage leading from said groove to said outlet duct, a bonnet covering said recess and plug, a stem extending from said plug through said bonnet and resilient means between said bonnet and said plug pressing on said plug to hold the conical surface of said plug in tight contact with the conical surface of said recess.

FRANK L. PARS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

